作者：Blade

Requirements for LED streetlight bulbs

 

Requirements for LED streetlight bulbs

 

Because you want to replace incandescent, so at least the following requirements:

Brightness should be very incandescent usually talk about wattage and not talk about the number of lumens. Although the LED also can talk about wattage, but due to the efficiency of LED streetlight bulbs are still evolving, saying only that the wattage does not mean that its lumen. The most commonly used incandescent lamp wattage of 15 watts, 30 watts, 45 watts, 60 watts, 75 watts and 100 watts. If you talk about the number of lumens, you can use incandescent light efficiency. Incandescent lamp luminous efficiency of 7.5-12lm / W The higher the wattage the greater the efficiency.

 

If using LED to replace, and can draw the appropriate wattage. However, because the led high bay luminous efficiency in the rising, it is difficult to give an accurate figure. Assumes the usual LED1, its luminous efficiency of 100lm / W, if the highest luminous efficiency of the LED2 is its luminous efficiency of 130lm / W (warm white light efficiency will be lower than this value). Can be drawn on the wattage of the two luminous efficiency LED. LED streetlight bulbs require constant current source, the constant current source efficiency is assumed to be 85%, In addition, because the LED can not adopt a transparent blister, but only using the milky foam shell. The transmittance of about 85%. They are multiplied together equal to 0.72. After considering the above factors can be drawn and incandescent lamps of equivalent wattage. Can be seen from the table, LED2 in the same brightness can save approximately 10 times the power. It should be of special note.

The applications of LED driver in mains LED lights

 

The applications of LED driver in mains LED lights

 

Very early that there have been a constant current diode, this diode is not a cause for concern, because it’s just as the current standard for some instrumentation. However, recently led the industry to flourish, these diodes are suddenly aroused widespread interest. Many foreign companies have developed products for driving mains LED lights because the led high bay light must be the reason of the constant current source driven. Here we will be in-depth discussion of the properties and applications of the constant current diode.

 

The ideal constant current source is an internal resistance for the infinite devices, irrespective of the voltage across the value, the current flows through will never change. Of course, this device could not exist. Constant-current diode is equivalent to a certain operating voltage range (for example, 25-100V), its current is constant for a particular value (eg 20mA).

 

And high-voltage LED compared discrete low-power mains LED lights. As mentioned earlier, high-voltage LED integrated LED a low-power discrete LED series and high-voltage LED external characteristic. The advantages of discrete LED’s flexibility, users needed the series of any number of LED to get the volt-ampere characteristic. Series and parallel can also be more flexible features. Discrete LED’s emitting surface can adjust (increase) in a certain range, so that luminous uniform, reduce glare. Separation of the mains LED lights heat dissipation area is relatively large, easy to disperse the heat, to simplify the design of the radiator. The integrated high-voltage mains LED lights reduces packaging costs. Integrated high-voltage LED reduce.

Analysis of the power supplier of household LED ceiling lights

 

Analysis of the power supplier of household LED ceiling lights

 

Here, the constant current diode is to input mains voltage changes to maintain the same output current, of course, can be eliminated due to the current caused by the household LED ceiling lights negative temperature coefficient increases. However, due to the pressure of the constant current diode to certain restrictions, so it can be absorbed by the supply voltage change is limited. 100V withstand voltage of the CRD, its operating voltage range is also minus its minimum operating voltage of 10V, the voltage range available, it was only 90V. 220V mains power supply, if the change of +10% to -20%, equivalent to the rectifier 290 ~ 211V, the voltage change of 79V in the range of its pressure. If the household LED ceiling lights 80, if the forward voltage of 3.3V, then the total voltage of 264V, exactly equivalent to 220V after bridge rectifier after the value. At this time there is no voltage drop across the constant current diode, but this time it is unable to work and need at least 10V voltage drop, which is required rectified voltage is 274V, the mains voltage is 228VAC. When the constant current diode voltage drop to a minimum, power consumption is minimum, only 0.03Ax10V = 0.3W, the overall efficiency of up to 96% (of course, but also consider the efficiency of the rectifier, in fact even lower). If power is increased to 242VAC, then the constant current diode voltage increased 26.4V, its power consumption is also increased to 0.79W, the efficiency of this time is equivalent to 91%.

 

Previously assumed that the led high bay light forward voltage drop of 3.3V, in fact even if its rated 3.3V, later in the boot of a period of time, the junction temperature increases, the forward voltage drop is reduced to 3.1V or even 3.0V.

The heat dissipation bathroom ceiling spotlights

 

The heat dissipation bathroom ceiling spotlights

 

Low-power bathroom ceiling spotlights beads, arranged dispersed, can contribute to the heat.

Ceiling structural characteristics conducive to heat dissipation.

 

1. the Internal block the free flow of air. This is the biggest advantages Ceiling compared to other lamps. Closed without the circulation of air is a good thermal insulation properties of the insulator, in turn, to the free flow of air is the best heat sink. All hot objects in the world’s last all the heat into the air to go. Ceiling floor there are a lot of holes in the Ceiling of the shade, the heat generated by the bathroom ceiling spotlights beads through the air immediately to pass to go outside.

 

2. Lampshade good heat dissipation. We know that the convection and radiation heat and the size and materials related to the effect of radiation cooling of the plastic is very good, and shade is thin, so the bad influence of the thermal conductivity of plastics can be ignored.

 

3. A large area: according to a circular area of ​​the formula: S = πr2, or S = π (d / 2) 2, a diameter of 45cm Round Ceiling, floor area is 1590cm2. Because Ceiling typically installed in the room, not too high at room temperature, so you can use the empirical data of 40cm2 / W, as can also be dispersed 40W of power. However, due to the floor near the ceiling, difficult to heat, so the actual cooling effect of the base plate will be worse. The key question is should install led high bay lights beads aluminum plate or PCB copper area has been large enough.

 

The composition and heat dissipation of the high performance led flash light

 

The composition and heat dissipation of the high performance led flash light

 

Not consider the gorgeous crystal ceiling lamps, ordinary high performance led flash light structure and ceiling lamps there is no difference. From the bottom shell, housing, power, light and other four parts.

 

Usually for power greater than 30W more than most of the 1W high performance led flash light beads, less than 30W of most of the low-power led high bay lamp (such as 3020,3014,3528, etc.). The recommended low-power LED chip, so that in the heat, can also increase the luminous uniformity. Lamp beads in accordance with their appearance to arrange, for example, assumes that the shape is round, light beads arranged in a circle, on the contrary, if the shape is square, then arranged in a square. Even so, the arrangement of the lamp beads are still there are many ways. It is 23 0.4W of 5730 high performance led flash light, for a total power of 18W. The middle of the rectangle for its constant current power supply, box the lower right corner, compared with remote control receiver photodiode, in order to receive infrared remote brightness control signal.

 

Need to be raised is still a large number of low-cost LED ceiling lamp with a low-power hat light, However, due to the thermal resistance of the straw hat lamp (450 ° C / W), it is difficult to heat export, and thus the light fades serious, life is very short .

 

The Ceiling Price has a few dozen to several hundred dollars, the foreign brands Ceiling to more than $ 600 As for the ceiling with crystal ornaments, the price is up more than a few thousand dollars everywhere, but its light only. However, at most, a 40W shaped fluorescent lamps. Ceiling unlike the ordinary energy-saving lamps are so cheap.

More U.S. TV buyers favor rgb led high power TV

More U.S. TV buyers favor rgb led high power TV

Consumers decided to buy a LED TV, 54% implemented in practical action. More convincing that those initial preference for the purchase of CCFL TV people eventuallybuy up to 81% LED TV.

LED and CCFL are two main types of LCD TV backlight, CCFL is the older technology.LED consumes less than the CCFL, longer life expectancy, but also more environmentally friendly, rgb led high power, does not contain mercury and lead chemicals. The LED backlighting can also produce a brighter white light and a wider range of contrast.

The latest survey results show that a better understanding of U.S. television buyers for thetechnology. The survey random sample of 45 000 surveyed each quarter from more thantwo million American families library, and the family library is continuously updated. Overthe years, the LCD has been dominant in television, even after the media widely publicized the advantages of this new LED technology, in a very long time, rgb led high power, the TV buyersare not aware of market information on the LED.

But in a rapidly changing, especially the LED-backlit TV prices fall, the exhibition hall ofthe retail channel was turned to new models. The fourth quarter of 2011, 42-inch 1080p,120Hz LED average price of $ 862, the same specifications as the CCFL LCD TV is $ 755. A year ago, LED high bay both the price difference is much larger, LED price is $ 1,049, while theLCD is $ 800.

The survey report also shows, including LED backlight and CCFL backlight for all LCD TVs accounting for the overall TV market, nine tenths, and the remaining 10% do not use any backlight plasma TV. LCD TV prices continued to fall, rgb led high power, coupled with thespecifications of plasma TVs as consumers feel the lower, a further blow to the dying and so ion market. Plasma TV is the ultimate exit the TV market seems a foregone conclusion.

“one Hour on earth” the led light energy saving friendly

"one Hour on earth" the led light energy saving friendly

The last Saturday of March, is “Earth Hour” activity days.
“Earth Hour” is issued to the world by the World Wide Fund for Nature in 2007, aninitiative calling for individuals, communities, businesses and governments turn off the lights in March each year on the last Saturday one hour, in order to motivate people toprotect the earth sense of responsibility, and thinking on climate change and otherenvironmental issues, the led light, make joint efforts against that of the global warming action of thesupport. This is a global event, WWF advocacy in Sydney in 2007 for the first time at an alarming rate, sweeping the globe.
The good momentum of development of LED lighting, and also highlights the people’sawareness of environmental protection, LED high bay began to pay attention to environmental stewardship. The purpose of the ball “is not in order to save power, but in order to make the public recognize the importance of protecting the earth and improve everyone’s awareness of environmental protection, to develop environmentally friendly habits in everyday life, in accordance with the 2007 global resource consumption and thecalculation of the average level of emissions of carbon dioxide, the led light,  the human needs 1.5 Earth in order to meet the needs of each person a small step, a big step for the earth.

As an innovative leader in the global lighting industry, Philips has been committed tocontinue to introduce meaningful and innovative lighting solutions, green lighting productsfor more Chinese families; the led light, and actively organize and promote energy saving and environmental protection concept of a variety of activities to encourage people toroomlighting the way a simple change in energy saving, warm and easy to enjoy the high quality of life. Since 2009, Philips Lighting to promote my actions, my Green “as the coreconcept of a series of environmental activities, diversification of publicity, with local governments to promote energy-saving lamps to poor households donated energy-saving lamps more than 40 million, the led light,  to build the country’s most influential energy conservation and environmental protection promotion platform.

Major significances on the energy saving for LED ceiling lights’ popularization

 

Major significances on the energy saving for LED ceiling lights’ popularization

 

LED ceiling to replace the ordinary fluorescent ceiling lamps can significantly save energy, thereby reducing carbon dioxide emissions. In general, for every 1 kWh of electricity savings can be reduced to 0.272 kg of carbon dioxide. From the measured results shows an 8W LED ceiling lights is about to replace a 16W ordinary fluorescent ceiling lamps, so you can power-saving 8W. Assuming average three hours a day turn on the lights, then the annual power saving of 8760 kWh, equivalent to 2382.72 kilograms of carbon dioxide emissions. Assuming that can produce 8 million in 2012 led high bay lamp, you could be saving a total of 70.08 billion kWh (82%) of the equivalent of 84.7 billion kWh of electricity a year issued by the Three Gorges Hydropower Station. Reduce 019 million tons of carbon dioxide emissions.

 

According to the latest report of the U.S. national Oceanic and Atmospheric Administration (NOAA), the average concentration of atmospheric carbon dioxide has been before the Industrial Revolution 280 ppm or so rise to the 389ppm in 2010. While China accounted for about 11 percent of global emissions in 1992, compared to 23 percent of the world in 2008, ranking first in the world. The global carbon dioxide emissions increased significantly in 2010, a record high. The global carbon dioxide emissions in 2010 to 33.5 billion tons, an increase of 1.88 billion tons last year, about 5.9%. China’s 2010 carbon dioxide emissions of about 7.5 billion tons. Commitment to the Durban climate conference planned 15% reduction in carbon emissions in 2015 than in 2010. If the 15% reduction in 2015 is 1.125 billion tons. 2015 to adopt 40 million LED ceiling lights, you can reduce 095 million tons of carbon dioxide emissions, accounting for 8.4% of the total number of commitments. This is a very impressive figure!

DOE released the latest test results of high powered led bulbs

DOE released the latest test results of high powered led bulbs

PNNL on each lights a test of three samples, using the integrating sphere LM-79photometric tests, these bulbs purchased in the summer of 2011, tests conducted in the fall. The report said these bulbs luminous efficiency 36 lm / W to 72 lumens / W ranging from an average of 53 lumens / watt. Minimum and maximum luminous efficiency hasincreased, the scope of the luminous efficiency is still wide, high powered led bulbs, the expected range of futurechanges in the luminous efficiency is increasing. This is because manufacturers are looking for different product types and application requirements.
The test consists of 11 A19 samples, the luminous efficiency of these samples are closeto 60 lumens / watt, high powered led bulbs, the power consumption of less than 10 watts bulb light efficiency of50 to 55 lm / W luminous efficiency greater than 10 watts for 55 to 70 lumens / watt.Compared to the previous round of testing, the maximum gap of 20 lumens / watt improvement more. In this test, the Department of Energy for the first time to assess theG25 sample, luminous efficiency of 35 to 55 lm / W, the report shows, although LEDG25scompared to halogen lamps, led high bay, energy-saving lamps more suitable for application in thestore shelves lighting. MR16 and PAR20LED of sample test results better, 8 PAR30sample being tested luminous efficiency, luminous efficiency of 50 to 55 lm / W in theenergy-saving lamps, plus or minus.
The test sample color temperature range of 2500K ~ 6000K, most of the samples in the2700-3000K range of. The entire test, the color difference was significantly lower pricesto the poor color rendering, color rendering index of some samples below 70, high powered led bulbs, most of thesamples is about 80.
But some samples in the test products exist size and shape, length of 6 11 A19 bulbdoes not meet the American National Standards Institute (ANSI) specification, 5 PAR20sample, there are two sizes too long, 9 PAR30 samples four dimensions is too long.
The report also pointed out that most manufacturers seem to be concentrated inhigh-lumen lamps, apartments and small rooms require less light output, on the contrary, high powered led bulbs, the market is difficult to find the standard light bulb of 400 lumens.

Guangzhou International solar LED lighting Fair held in February

 

Guangzhou International solar LED lighting Fair held in February

 

Guangzhou Optical Valley officially opened in November 2011, pre-assigned to the OSRAM / the PHILIPS / Neo-Neon / ground / SFT and so well-known enterprises in the industry, Guangzhou Optical Valley booth thousands, of varying sizes to meet the different needs of any customer. See the opening of the Guangzhou Optical Valley, so I suddenly had an idea, such a large physical trading market will lead to the Guangzhou International solar LED lighting Exhibition what kind of effect? I do some simple analysis of hope that we can discuss with you the next:

 

1, from the perspective of client resources to analyze, Guangzhou Optical Valley of the customer base and the Guangzhou International solar LED lighting Exhibition customer base is exactly the same, so from this level will have a positive conflict;

 

2, from the perspective of visitor resources, Guangzhou Optical Valley of the audience and the Guangzhou International Lighting Fair audience is basically the same, so from this level will have a direct conflict;

 

3, from the industry well-known analysis, Guangzhou Optical Valley is newly established, although the national government and local government policies and funding strong support, but due to the newly established, well-known in the industry or needs to be greatly enhanced; Guangzhou international Lighting Fair has been held for the 16th, and now with the Frankfurt exhibition started doing in-depth cooperation, and therefore the visibility of the led high bay industry and customer acceptance is very high;

 

From long-term trend analysis, the Guangzhou International Lighting Exhibition held four days each time, but fees for exhibitors are more expensive, but look at the results of the exhibition of these four days, can be described as mixed, many companies have complained that investment costs can not be recovered from the show. Guangzhou Optical Valley.